GB1130788A - Improvements in turbine overspeed trip anticipator - Google Patents

Improvements in turbine overspeed trip anticipator

Info

Publication number
GB1130788A
GB1130788A GB29370/66A GB2937066A GB1130788A GB 1130788 A GB1130788 A GB 1130788A GB 29370/66 A GB29370/66 A GB 29370/66A GB 2937066 A GB2937066 A GB 2937066A GB 1130788 A GB1130788 A GB 1130788A
Authority
GB
United Kingdom
Prior art keywords
speed
trip
valve
anticipator
stop
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB29370/66A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Publication of GB1130788A publication Critical patent/GB1130788A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
    • F01D21/02—Shutting-down responsive to overspeed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/20—Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted
    • F01D17/22—Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted the operation or power assistance being predominantly non-mechanical
    • F01D17/26—Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted the operation or power assistance being predominantly non-mechanical fluid, e.g. hydraulic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
    • F01D21/16—Trip gear
    • F01D21/18—Trip gear involving hydraulic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
    • F01K7/22—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type the turbines having inter-stage steam heating
    • F01K7/24—Control or safety means specially adapted therefor
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D13/00—Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
    • H02P23/16—Controlling the angular speed of one shaft

Abstract

1,130,788. Steam turbine plant; engine stopgear. GENERAL ELECTRIC CO. June 30, 1966 [July 1, 1965], No.29370/66. Headings F1K and F1T. [Also in Division G3] In a steam turbine plant comprising a speed governor 12 controlling a set of control valves 3, and an emergency overspeed trip 15 for closing a stop valve 2, means are provided for closing the stop-valve 2 at a trip-anticipator speed which is above the normal speed but below the speed setting of the overspeed trip. If the speed thereafter falls below the trip-anticipator speed without having first exceeded the overspeed trip setting, the stop-valve 2 is re-opened. Since the stop-valve 2 is closed in anticipation of the operation of the overspeed trip, the peak speed attained after any such operation is less than it would otherwise have been. The speed governor 12 operates the control valves 3 through a servomotor 20 and a relay 13. The servomotor 20 comprises a pilot valve 21 controlling a servopiston 27, the fulcrum 24 of the follow-up lever 23 being adjustable to set the desired load corresponding to the normal speed. The overspeed trip 15, shown as an offcentre bolt device, is arranged to actuate a pivotable trip finger 30 to release a spring-loaded dump valve 32 to release hydraulic pressure in a conduit 34, feeding a relay 16 holding the stopvalve 2 open, whereby the stop-valve closes until the trip has been reset manually. The tripanticipator comprises a pilot valve 36 operated in accordance with speed, by a governor which may, as shown, be the main speed governor 12. When the trip-anticipator speed is reached, the valve 36 releases the hydraulic pressure in a conduit 40 to cause a spring-loaded dump valve 37 to release the hydraulic pressure in a conduit 35 feeding the relay 16. The stop-valve 2 consequently closes. Provided the turbine speed does not thereafter reach a value at which the overspeed trip 15 is operated, the stop-valve 2 re-opens when the speed subsequently falls below the trip-anticipator speed. Instead of being constant, the trip-anticipator speed setting may decrease at loads above 85% of full load to reduce still further the peak speed attained upon loss of such loads. In this case, when the control valves 3 are opened beyond the opening corresponding to 85% of full load, the sleeve 39 of the pilot valve 36 is raised from its normal position by an extension 56 of the piston rod of servomotor piston 27, acting through an adjustment screw 57 and a lever 51, to reduce the trip-anticipator speed. A dashpot 58 holds the sleeve 39 in its elevated position for a few seconds after a sudden drop of the extension 56 caused by sudden loss of load, to give time for the reduced setting of the trip-anticipator speed to take effect. In the case of a multi-stage turbine, the intercept valve and the stop-valve at the inlet to the I.P. turbine are controlled jointly with the valves 3, and 2, as indicated at 29, and 34a, 35a.
GB29370/66A 1965-07-01 1966-06-30 Improvements in turbine overspeed trip anticipator Expired GB1130788A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US46888765A 1965-07-01 1965-07-01

Publications (1)

Publication Number Publication Date
GB1130788A true GB1130788A (en) 1968-10-16

Family

ID=23861639

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29370/66A Expired GB1130788A (en) 1965-07-01 1966-06-30 Improvements in turbine overspeed trip anticipator

Country Status (3)

Country Link
CH (1) CH454904A (en)
DE (1) DE1551179B2 (en)
GB (1) GB1130788A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1522681A3 (en) * 2003-09-22 2006-10-04 Kabushiki Kaisha Toshiba Protection system for turbo machine and power generating equipment

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115853931B (en) * 2023-03-03 2023-05-09 太原矿机电气股份有限公司 Speed limiting braking control system with adjustable speed limiting value

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1522681A3 (en) * 2003-09-22 2006-10-04 Kabushiki Kaisha Toshiba Protection system for turbo machine and power generating equipment
US7234678B1 (en) 2003-09-22 2007-06-26 Kabushiki Kaisha Toshiba Protection system for turbo machine and power generating equipment
US7322788B2 (en) 2003-09-22 2008-01-29 Kabushiki Kaisha Toshiba Protection system for turbo machine and power generating equipment

Also Published As

Publication number Publication date
DE1551179B2 (en) 1970-04-02
CH454904A (en) 1968-04-30
DE1551179A1 (en) 1969-12-04

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